Descripción general

Irritable bowel syndrome (IBS) is a common disorder that affects the large intestine. Signs and symptoms include cramping, abdominal pain, bloating, gas, and diarrhea or constipation, or both. IBS is a chronic condition that you'll need to manage long term.

Only a small number of people with IBS have severe signs and symptoms. Some people can control their symptoms by managing diet, lifestyle and stress. More-severe symptoms can be treated with medication and counseling.

IBS doesn't cause changes in bowel tissue or increase your risk of colorectal cancer.

Síntomas

The signs and symptoms of IBS vary. The most common include:

  • Abdominal pain, cramping or bloating that is typically relieved or partially relieved by passing a bowel movement
  • Excess gas
  • Diarrhea or constipation — sometimes alternating bouts of diarrhea and constipation
  • Mucus in the stool

Most people with IBS experience times when the signs and symptoms are worse and times when they improve or even disappear completely.

When to see a doctor

See your doctor if you have a persistent change in bowel habits or other signs or symptoms of IBS. They may indicate a more serious condition, such as colon cancer. More-serious signs and symptoms include:

  • Weight loss
  • Diarrhea at night
  • Rectal bleeding
  • Iron deficiency anemia
  • Unexplained vomiting
  • Difficulty swallowing
  • Persistent pain that isn't relieved by passing gas or a bowel movement

Causas

The precise cause of IBS isn't known. Factors that appear to play a role include:

  • Muscle contractions in the intestine. The walls of the intestines are lined with layers of muscle that contract as they move food through your digestive tract. Contractions that are stronger and last longer than normal can cause gas, bloating and diarrhea. Weak intestinal contractions can slow food passage and lead to hard, dry stools.
  • Nervous system. Abnormalities in the nerves in your digestive system may cause you to experience greater than normal discomfort when your abdomen stretches from gas or stool. Poorly coordinated signals between the brain and the intestines can cause your body to overreact to changes that normally occur in the digestive process, resulting in pain, diarrhea or constipation.
  • Inflammation in the intestines. Some people with IBS have an increased number of immune-system cells in their intestines. This immune-system response is associated with pain and diarrhea.
  • Severe infection. IBS can develop after a severe bout of diarrhea (gastroenteritis) caused by bacteria or a virus. IBS might also be associated with a surplus of bacteria in the intestines (bacterial overgrowth).
  • Changes in bacteria in the gut (microflora). Microflora are the "good" bacteria that reside in the intestines and play a key role in health. Research indicates that microflora in people with IBS might differ from microflora in healthy people.

Triggers

Symptoms of IBS can be triggered by:

  • Food. The role of food allergy or intolerance in IBS isn't fully understood. A true food allergy rarely causes IBS. But many people have worse IBS symptoms when they eat or drink certain foods or beverages, including wheat, dairy products, citrus fruits, beans, cabbage, milk and carbonated drinks.
  • Stress. Most people with IBS experience worse or more frequent signs and symptoms during periods of increased stress. But while stress may aggravate symptoms, it doesn't cause them.
  • Hormones. Women are twice as likely to have IBS, which might indicate that hormonal changes play a role. Many women find that signs and symptoms are worse during or around their menstrual periods.

Factores de riesgo

Many people have occasional signs and symptoms of IBS. But you're more likely to have the syndrome if you:

  • Are young. IBS occurs more frequently in people under age 50.
  • Are female. In the United States, IBS is more common among women. Estrogen therapy before or after menopause also is a risk factor for IBS.
  • Have a family history of IBS. Genes may play a role, as may shared factors in a family's environment or a combination of genes and environment.
  • Have a mental health problem. Anxiety, depression and other mental health issues are associated with IBS. A history of sexual, physical or emotional abuse also might be a risk factor.

Complicaciones

Chronic constipation or diarrhea can cause hemorrhoids.

In addition, IBS is associated with:

  • Poor quality of life. Many people with moderate to severe IBS report poor quality of life. Research indicates that people with IBS miss three times as many days from work as do those without bowel symptoms.
  • Mood disorders. Experiencing the signs and symptoms of IBS can lead to depression or anxiety. Depression and anxiety also can make IBS worse.

Prevención

Encontrar maneras de lidiar con el estrés puede ayudar a prevenir o aliviar los síntomas del síndrome del intestino irritable. Considera probar:

  • Asesoramiento psicológico. Un asesor puede ayudarte a aprender a modificar o cambiar tu respuesta al estrés. Los estudios demostraron que la psicoterapia puede proporcionar una reducción significativa y duradera de los síntomas.
  • Biorretroalimentación. Los sensores eléctricos te ayudan a recibir información (retroalimentación) sobre las funciones corporales. Esta retroalimentación te ayuda a concentrarte en la realización de cambios sutiles, como relajar determinados músculos, para aliviar los síntomas.
  • Ejercicios de relajación progresiva. Estos ejercicios te ayudan a relajar los músculos del cuerpo, uno por uno. Comienza tensando los músculos de los pies, luego, concéntrate en liberar toda la tensión gradualmente. A continuación, tensa y relaja las pantorrillas. Repite el proceso hasta que todos los músculos del cuerpo, incluso los de los ojos y los del cuero cabelludo, estén relajados.
  • Entrenamiento de consciencia plena. Esta técnica de reducción del estrés te ayuda a centrarte en el momento presente y a olvidar tanto las preocupaciones como las distracciones.